XGMotion.c revision 190694da 
1/************************************************************
2
3Copyright 1989, 1998  The Open Group
4
5Permission to use, copy, modify, distribute, and sell this software and its
6documentation for any purpose is hereby granted without fee, provided that
7the above copyright notice appear in all copies and that both that
8copyright notice and this permission notice appear in supporting
9documentation.
10
11The above copyright notice and this permission notice shall be included in
12all copies or substantial portions of the Software.
13
14THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
17OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
18AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
19CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
20
21Except as contained in this notice, the name of The Open Group shall not be
22used in advertising or otherwise to promote the sale, use or other dealings
23in this Software without prior written authorization from The Open Group.
24
25Copyright 1989 by Hewlett-Packard Company, Palo Alto, California.
26
27			All Rights Reserved
28
29Permission to use, copy, modify, and distribute this software and its
30documentation for any purpose and without fee is hereby granted,
31provided that the above copyright notice appear in all copies and that
32both that copyright notice and this permission notice appear in
33supporting documentation, and that the name of Hewlett-Packard not be
34used in advertising or publicity pertaining to distribution of the
35software without specific, written prior permission.
36
37HEWLETT-PACKARD DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
38ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL
39HEWLETT-PACKARD BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR
40ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS,
41WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION,
42ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
43SOFTWARE.
44
45********************************************************/
46
47/***********************************************************************
48 *
49 * XGetDeviceMotionEvents - Get the motion history of an input device.
50 *
51 */
52#ifdef HAVE_CONFIG_H
53#include <config.h>
54#endif
55
56#include <X11/extensions/XI.h>
57#include <X11/extensions/XIproto.h>
58#include <X11/Xlibint.h>
59#include <X11/extensions/XInput.h>
60#include <X11/extensions/extutil.h>
61#include "XIint.h"
62#include <limits.h>
63
64XDeviceTimeCoord *
65XGetDeviceMotionEvents(
66    register Display	*dpy,
67    XDevice		*dev,
68    Time		 start,
69    Time		 stop,
70    int			*nEvents,
71    int			*mode,
72    int			*axis_count)
73{
74    xGetDeviceMotionEventsReq *req;
75    xGetDeviceMotionEventsReply rep;
76    XDeviceTimeCoord *tc;
77    int *data, *bufp, *readp, *savp;
78    unsigned long size;
79    int i, j;
80    XExtDisplayInfo *info = XInput_find_display(dpy);
81
82    LockDisplay(dpy);
83    if (_XiCheckExtInit(dpy, XInput_Initial_Release, info) == -1)
84	return ((XDeviceTimeCoord *) NoSuchExtension);
85
86    GetReq(GetDeviceMotionEvents, req);
87    req->reqType = info->codes->major_opcode;
88    req->ReqType = X_GetDeviceMotionEvents;
89    req->start = start;
90    req->stop = stop;
91    req->deviceid = dev->device_id;
92
93    if (!_XReply(dpy, (xReply *) & rep, 0, xFalse)) {
94	UnlockDisplay(dpy);
95	SyncHandle();
96	*nEvents = 0;
97	return (NULL);
98    }
99
100    *mode = rep.mode;
101    *axis_count = rep.axes;
102    *nEvents = rep.nEvents;
103    if (!rep.nEvents) {
104	UnlockDisplay(dpy);
105	SyncHandle();
106	return (NULL);
107    }
108    if (rep.length < (INT_MAX >> 2)) {
109	size = rep.length << 2;
110	savp = readp = Xmalloc(size);
111    } else {
112	size = 0;
113	savp = readp = NULL;
114    }
115    /* rep.axes is a CARD8, so assume max number of axes for bounds check */
116    if (rep.nEvents <
117	(INT_MAX / (sizeof(XDeviceTimeCoord) + (UCHAR_MAX * sizeof(int))))) {
118	size_t bsize = rep.nEvents *
119	    (sizeof(XDeviceTimeCoord) + (rep.axes * sizeof(int)));
120	bufp = Xmalloc(bsize);
121    } else
122	bufp = NULL;
123    if (!bufp || !savp) {
124	Xfree(bufp);
125	Xfree(savp);
126	*nEvents = 0;
127	_XEatData(dpy, (unsigned long)size);
128	UnlockDisplay(dpy);
129	SyncHandle();
130	return (NULL);
131    }
132    _XRead(dpy, (char *)readp, size);
133
134    tc = (XDeviceTimeCoord *) bufp;
135    data = (int *)(tc + rep.nEvents);
136    for (i = 0; i < *nEvents; i++, tc++) {
137	tc->time = *readp++;
138	tc->data = data;
139	for (j = 0; j < *axis_count; j++)
140	    *data++ = *readp++;
141    }
142    XFree((char *)savp);
143    UnlockDisplay(dpy);
144    SyncHandle();
145    return ((XDeviceTimeCoord *) bufp);
146}
147
148void
149XFreeDeviceMotionEvents(XDeviceTimeCoord *events)
150{
151    XFree((char *)events);
152}
153